A lid opening and closing mechanism

Abstract

The application relates to the technical field of medical equipment, and discloses a cover opening and closing mechanism, which comprises a supporting plate, a rear end assembly, a first buffer assembly, a front end plate and a second buffer assembly; the rear end assembly comprises a rear end shell, a driving motor and a cover clamping assembly; one end of the first buffer assembly is slidably connected to the supporting plate in the vertical direction, and the other end of the first buffer assembly is connected to the rear end shell; the front end plate is provided with a through hole, and a pipe cover can pass through the through hole; one end of the second buffer assembly is slidably connected to the rear end shell in the vertical direction, and the other end of the second buffer assembly is connected to the front end plate. The double-buffering structure can simultaneously produce buffering effects on the pipe body and the pipe cover of consumables, so that the pipe body and the pipe cover are prevented from being damaged, the application can reduce the damage to the consumables during use, and further reduce the additional consumption of the consumables, the re-sampling of doctors and patients and the lag of obtaining the examination results, and thus the time and economic cost are greatly saved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to an opening and closing cover mechanism. Background Technology

[0002] Traditional quantitative PCR (qPCR) molecular detection techniques mainly involve nucleic acid extraction, reagent aliquoting, qPCR instrument testing, and result analysis. Therefore, traditional molecular diagnostic reagents suffer from drawbacks such as high costs associated with setting up and operating detection platforms, expensive equipment, the need for specialized operators, cumbersome manual operation, long testing cycles, susceptibility to contamination, and safety risks to operators. The use of molecular point-of-care testing (POCT) devices, however, lowers the barriers to entry in terms of operator skill requirements and the cost of laboratory platform setup and operation.

[0003] However, the opening and closing mechanism of existing molecular POCT devices usually uses a robotic gripper mechanism. During the movement of the robotic arm, the gripper is prone to collision with consumables, which can damage the consumables and affect the reaction of reagents. Summary of the Invention

[0004] The purpose of this invention is to provide an opening and closing mechanism that can reduce damage to consumables during use, thereby reducing the additional consumption of consumables and the delay in resampling and obtaining test results for doctors and patients, thus greatly saving time and economic costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a cover opening and closing mechanism for opening or closing a consumable, wherein the consumable includes a tube body and a cover, the cover being disposed on the tube body, and the cover opening and closing mechanism includes:

[0007] Support plate;

[0008] The rear-end assembly includes a rear-end housing, a drive motor, and a cover assembly. The drive motor and the cover assembly are both mounted on the rear-end housing. The drive end of the drive motor is connected to the cover assembly and is used to drive the cover assembly to rotate so as to engage the tube cap.

[0009] A first buffer assembly, one end of which is slidably connected to the support plate in the vertical direction, and the other end of which is connected to the rear end housing; the first buffer assembly is used to buffer the rear end housing in the vertical direction.

[0010] The front end plate is spaced below the rear end assembly. The front end plate has a through hole through which the tube cap can pass. The front end plate can abut against the tube body in the vertical direction.

[0011] The second buffer assembly has one end slidably connected to the rear end housing along the vertical direction, and the other end connected to the front end plate; the second buffer assembly is used to buffer the front end plate along the vertical direction.

[0012] As an optional solution for the opening and closing mechanism, the first buffer assembly includes a first guide post, a first elastic member, and a first connector. A first guide hole is provided on the support plate along the vertical direction, and the first guide post is slidably disposed in the first guide hole. The first connector is connected to the upper end of the first guide post to abut against the support plate, and the lower end of the first guide post is connected to the rear end housing. The first elastic member is sleeved on the first guide post, and both ends of the first elastic member abut against the support plate and the rear end housing, respectively.

[0013] As an optional solution to the above-mentioned opening and closing mechanism, the second buffer assembly includes a second guide post, a second elastic member, and a second connecting member. A second guide hole is provided on the rear housing along the vertical direction, and the second guide post is slidably disposed in the second guide hole. The second connecting member is connected to the upper end of the second guide post to abut against the rear housing, and the lower end of the second guide post is connected to the front plate. The second elastic member is sleeved on the second guide post, and the two ends of the second elastic member abut against the rear housing and the front plate, respectively.

[0014] As an alternative to the above-mentioned opening and closing mechanism, the elastic coefficient of the first elastic element is greater than that of the second elastic element.

[0015] As an optional embodiment of the aforementioned opening and closing cover mechanism, the aforementioned cover assembly includes a cover gear, a rotating shaft, a limiting member, a third elastic member, and a snap-fit ​​cover. The cover gear is connected to the upper end of the rotating shaft, and the snap-fit ​​cover is connected to the lower end of the rotating shaft. The rotating shaft has a receiving cavity, and the third elastic member and the limiting member are both disposed within the receiving cavity. The two ends of the third elastic member abut against the inner wall of the receiving cavity and the limiting member, respectively, so that the limiting member abuts against the snap-fit ​​cover. The snap-fit ​​cover has a snap-fit ​​hole, through which the cover can pass to snap-fit ​​between the limiting member and the snap-fit ​​cover.

[0016] As an alternative to the above-mentioned opening and closing mechanism, the limiting member is provided with a guide protrusion, the rotating shaft is provided with a guide groove, and the guide protrusion is slidably disposed in the guide groove along the vertical direction.

[0017] As an alternative to the above-mentioned opening and closing mechanism, the tube cover is provided with a square limiting plate, the snap-fit ​​hole is a square limiting hole, and the length of the diagonal of the square limiting plate is greater than the length of the side of the square limiting hole.

[0018] As an alternative to the opening and closing cover mechanism, the rear end assembly further includes a gear assembly, which includes a first gear, a second gear, and a gear shaft. The first gear and the second gear are coaxially mounted on the gear shaft along the vertical direction. The first gear is meshed with the drive end of the drive motor, and the second gear is meshed with the cover locking gear.

[0019] As an alternative to the above-mentioned opening and closing cover mechanism, multiple cover assemblies are provided, and the multiple cover assemblies are arranged around the gear assembly.

[0020] As an alternative to the aforementioned opening and closing mechanism, multiple gear assemblies are provided, and the multiple gear assemblies are arranged around the drive end of the aforementioned drive motor.

[0021] The beneficial effects of this invention are as follows:

[0022] The opening and closing mechanism includes a support plate, a rear end assembly, a first buffer assembly, a front end plate, and a second buffer assembly. The rear end assembly includes a rear end housing, a drive motor, and a locking assembly. Both the drive motor and the locking assembly are mounted on the rear end housing. The drive end of the drive motor is connected to the locking assembly and is used to drive the locking assembly to rotate and lock the pipe cover, allowing the pipe cover to move with the locking assembly, thus enabling the installation or removal of the pipe cover from the pipe body. One end of the first buffer assembly is slidably connected to the support plate in the vertical direction, and the other end is connected to the rear end housing. The first buffer assembly is used to buffer the rear end housing in the vertical direction, thus providing cushioning when the locking assembly locks the pipe cover, preventing the locking assembly from damaging the pipe cover. Meanwhile, one end of the second buffer assembly is slidably connected to the rear end housing in a vertical direction, and the other end is connected to the front end plate. The second buffer assembly is used to buffer the front end plate in a vertical direction. The front end plate is spaced below the rear end assembly and has a through hole through which the tube cap can pass. The front end plate can also abut against the tube body in a vertical direction. Thus, before the tube cap passes through the through hole and is engaged with the cap assembly, the front end plate can abut against the tube body and provide cushioning, thereby preventing the front end plate from damaging the tube body. This opening and closing mechanism forms a double buffer structure through the first and second buffer assemblies, providing a buffering effect on the tube body and tube cap of the consumable, thereby preventing damage to the tube body and tube cap and affecting the reagent reaction. This invention can reduce damage to consumables during use, and consequently the additional consumption of consumables, as well as the delay in resampling and obtaining test results for doctors and patients, thus greatly saving time and economic costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the opening and closing cover mechanism provided in an embodiment of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the opening and closing cover mechanism provided in an embodiment of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the structure of the consumables provided in an embodiment of the present invention;

[0026] Figure 4 This is a partial structural schematic diagram of the opening and closing cover mechanism provided in an embodiment of the present invention;

[0027] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0028] Figure 6 This is a schematic diagram of the structure of the card cover assembly provided in an embodiment of the present invention;

[0029] Figure 7 This is an exploded view of the card cover assembly provided in an embodiment of the present invention.

[0030] In the picture:

[0031] 1. Support plate; 2. Rear end assembly; 21. Rear end housing; 22. Drive motor; 23. Cover assembly; 231. Cover gear; 232. Rotating shaft; 2321. Guide groove; 233. Limiting element; 2331. Guide protrusion; 234. Third elastic element; 235. Snap-fit ​​cover; 2351. Snap-fit ​​hole; 236. Bearing; 24. Gear assembly; 241. First gear; 242. Second gear; 243. Gear shaft; 3. First buffer assembly; 31. First guide post; 32. First elastic element; 33. First connector; 4. Front end plate; 41. Through hole; 5. Second buffer assembly; 51. Second guide post; 52. Second elastic element; 53. Second connector; 6. Consumables; 61. Tube body; 611. Rectangular limiting plate; 62. Tube cover; 621. Square limiting plate. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] This embodiment provides an opening and closing mechanism for opening or closing the lid of the consumable 6, wherein the consumable 6 includes a tube body 61 and a tube cover 62, and the tube cover 62 is disposed on the tube body 61.

[0037] like Figures 1 to 7As shown, the opening and closing mechanism includes a support plate 1, a rear end assembly 2, a first buffer assembly 3, a front end plate 4, and a second buffer assembly 5. The rear end assembly 2 includes a rear end housing 21, a drive motor 22, and a cover clamping assembly 23. Both the drive motor 22 and the cover clamping assembly 23 are mounted on the rear end housing 21. The drive end of the drive motor 22 is connected to the cover clamping assembly 23 and is used to drive the cover clamping assembly 23 to rotate and clamp the pipe cover 62, allowing the pipe cover 62 to move with the cover clamping assembly 23, thus enabling the installation or removal of the pipe cover 62 from the pipe body 61. One end of the first buffer assembly 3 is slidably connected to the support plate 1 in the vertical direction, and the other end of the first buffer assembly 3 is connected to the rear end housing 21. The first buffer assembly 3 is used to buffer the rear end housing 21 in the vertical direction, thereby providing cushioning when the cover clamping assembly 23 clamps the pipe cover 62, preventing the cover clamping assembly 23 from damaging the pipe cover 62.

[0038] Meanwhile, one end of the second buffer assembly 5 is slidably connected to the rear housing 21 in a vertical direction, and the other end of the second buffer assembly 5 is connected to the front plate 4. The second buffer assembly 5 is used to buffer the front plate 4 in a vertical direction. The front plate 4 is spaced below the rear assembly 2. The front plate 4 has a through hole 41 through which the tube cap 62 can pass. The front plate 4 can abut against the tube body 61 in a vertical direction. Thus, before the tube cap 62 passes through the through hole 41 and is snapped into the cap assembly 23, the front plate 4 can abut against the tube body 61 and generate buffer, thereby preventing the front plate 4 from damaging the tube body 61. This opening and closing mechanism can form a double buffer structure through the first buffer assembly 3 and the second buffer assembly 5, and generate a buffering effect on the tube body 61 and tube cap 62 of the consumable 6, thereby preventing damage to the tube body 61 and tube cap 62 and affecting the reaction of the reagent. This invention can reduce damage to consumables during use, thereby reducing additional consumption of consumables and delays in resampling and obtaining test results for both doctors and patients, thus greatly saving time and economic costs. Optionally, a rectangular limiting plate 611 is provided on the tube body 61, which can abut against the lower surface of the front end plate 4, such as... Figure 2 and Figure 3 As shown. Of course, the limiting plate on the tube body 61 can also be other shapes, and this embodiment does not specifically limit it. Further optionally, the support plate 1 is mounted on the moving module of the POCT equipment.

[0039] like Figure 1 and Figure 4As shown, the first buffer assembly 3 includes a first guide post 31, a first elastic element 32, and a first connector 33. A first guide hole is provided on the support plate 1 along the vertical direction. The first guide post 31 is slidably disposed in the first guide hole. The first connector 33 is connected to the upper end of the first guide post 31 to abut against the support plate 1, thereby preventing the first guide post 31 from detaching from the support plate 1. The lower end of the first guide post 31 is connected to the rear end housing 21. Thus, by using the first guide post 31, the rear end housing 21 can move relative to the support plate 1. The first elastic element 32 is sleeved on the first guide post 31, and the two ends of the first elastic element 32 abut against the support plate 1 and the rear end housing 21, respectively. Thus, when the rear end housing 21 moves closer to the support plate 1, the first elastic element 32 can buffer the rear end housing 21, thereby realizing the buffer between the cover assembly 23 and the tube cover 62.

[0040] Meanwhile, the second buffer assembly 5 includes a second guide post 51, a second elastic element 52, and a second connecting element 53. A second guide hole is provided on the rear housing 21 in the vertical direction. The second guide post 51 is slidably disposed in the second guide hole. The second connecting element 53 is connected to the upper end of the second guide post 51 to abut against the rear housing 21, thereby preventing the second guide post 51 from detaching from the rear housing 21. The lower end of the second guide post 51 is connected to the front plate 4. Thus, by using the second guide post 51, the front plate 4 can move relative to the rear housing 21. The second elastic element 52 is sleeved on the second guide post 51, and the two ends of the second elastic element 52 abut against the rear housing 21 and the front plate 4, respectively. Thus, when the front plate 4 moves closer to the rear housing 21, the second elastic element 52 can buffer the front plate 4, thereby realizing the buffer between the front plate 4 and the tube body 61. Optionally, the elastic coefficient of the first elastic element 32 is greater than that of the second elastic element 52. As a result, during the process of the opening and closing mechanism approaching the consumable 6 to engage with the tube cap 62, the movement of the rear shell 21 towards the front plate 4 is greater than the movement of the support plate 1 towards the rear shell 21. This allows the opening and closing mechanism to continue moving forward after the cap engagement assembly 23 engages with the tube cap 62, thereby providing over-position protection.

[0041] like Figure 3 , Figure 6 and Figure 7As shown, the cover assembly 23 includes a cover gear 231, a rotating shaft 232, a limiting member 233, a third elastic member 234, and a snap-fit ​​cover 235. The cover gear 231 is connected to the upper end of the rotating shaft 232, and the snap-fit ​​cover 235 is connected to the lower end of the rotating shaft 232. Thus, after the cover gear 231 rotates, the rotating shaft 232 and the snap-fit ​​cover 235 can rotate synchronously, satisfying the snap-fit ​​requirement of the snap-fit ​​cover 235 on the tube cap 62. The rotating shaft 232 has a receiving cavity, and the third elastic member 234 and the limiting member 233 are both disposed in the receiving cavity. The two ends of the third elastic member 234 respectively abut against the inner wall of the receiving cavity. The limiting member 233 abuts against the snap-fit ​​cover 235, and the snap-fit ​​cover 235 is provided with a snap-fit ​​hole 2351. The tube cap 62 can pass through the snap-fit ​​hole 2351 to snap between the limiting member 233 and the snap-fit ​​cover 235. After the snap-fit ​​cover assembly 23 moves upward, the tube cap 62 can be pulled out from the tube body 61. At the same time, the third elastic member 234 can drive the limiting member 233 to move towards the snap-fit ​​cover 235, so that the limiting member 233 and the snap-fit ​​cover 235 clamp the tube cap 62, thereby preventing the tube cap 62 from being misaligned during the movement, which would prevent the tube cap 62 from being installed on the tube body 61.

[0042] The limiting member 233 is provided with a guide protrusion 2331, and the rotating shaft 232 is provided with a guide groove 2321. The guide protrusion 2331 slides vertically within the guide groove 2321. The guide protrusion 2331 and guide groove 2321 ensure that the limiting member 233 moves vertically, preventing tilting and rotation relative to the rotating shaft 232. Specifically, the tube cover 62 is provided with a square limiting plate 621, and the snap-fit ​​hole 2351 is a square limiting hole. The diagonal length of the square limiting plate 621 is greater than the side length of the square limiting hole. Therefore, as the snap-fit ​​assembly 23 moves closer to the consumable 6, the square limiting plate 621 on the tube cover 62 can pass through the square limiting hole into the receiving cavity. After rotating the snap-fit ​​cover 235, the square limiting plate 621 cannot disengage from the square limiting hole, allowing the tube cover 62 to be pulled out from the tube body 61. Of course, the snap-fit ​​hole 2351 and the limiting plate on the tube cap 62 can also be other shapes, and this embodiment does not impose specific limitations. Optionally, a plurality of bearings 236 are sleeved on the rotating shaft 232, and the plurality of bearings 236 are connected to the rear housing 21, so as to further improve the stability of the rotating shaft 232 during rotation by means of the bearings 236.

[0043] like Figure 4 and Figure 5As shown, the rear-end component 2 also includes a gear assembly 24, which includes a first gear 241, a second gear 242, and a gear shaft 243. The first gear 241 and the second gear 242 are coaxially mounted on the gear shaft 243 in the vertical direction. The first gear 241 is meshed with the drive end of the drive motor 22, and the second gear 242 is meshed with the cover gear 231. This realizes the transmission between the drive motor 22 and the cover assembly 23, facilitating the spatial arrangement of the cover assembly 23. Optionally, multiple cover assemblies 23 are provided, and multiple cover assemblies 23 are arranged around the gear assembly 24. Thus, through the meshing of the cover gear 231 on multiple cover assemblies 23 with the same second gear 242, the synchronous rotation of multiple cover assemblies 23 can be realized, satisfying the requirement for the cover opening and closing mechanism to simultaneously open the covers of multiple consumables 6. Alternatively, multiple gear assemblies 24 are provided, with multiple gear assemblies 24 arranged around the drive end of the drive motor 22. By meshing the first gear 241 on multiple gear assemblies 24 with the gear on the drive end of the same drive motor 22, the synchronous rotation of multiple sets of cover assemblies 23 can be achieved, thereby further increasing the number of covers opened by the cover opening mechanism for the consumable 6.

[0044] In this embodiment, the opening and closing mechanism of the POCT device is first moved above multiple consumables 6 by the moving module; then the opening and closing mechanism is driven to move downward by the moving module. During the movement, the front end plate 4 first abuts against the rectangular limiting plate 611 of the tube cap 62, and the front end plate 4 is blocked and stops moving; then the rear end component 2 continues to move downward, so that the square limiting plate 621 of the tube cap 62 enters the receiving cavity of the rotating shaft 232; then the drive motor 22 drives the locking cover 235 to rotate to lock the square limiting plate 621; then the moving module drives the card box cover mechanism to move upward, realizing the opening of the consumables 6; then the PCR reaction reagent is loaded into the tube body 61, and the tube cap 62 and tube body 61 are closed by the opening and closing mechanism. In the above process, the first buffer component 3 and the second buffer component 5 produce a double buffering effect.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A cover opening and closing mechanism for opening or closing a consumable (6), the consumable (6) comprising a tube body (61) and a cover (62), the cover (62) being disposed on the tube body (61), characterized in that, The opening and closing mechanism includes: Support plate (1); The rear end assembly (2) includes a rear end housing (21), a drive motor (22), and a cover assembly (23). The drive motor (22) and the cover assembly (23) are both located on the rear end housing (21). The drive end of the drive motor (22) is connected to the cover assembly (23) and is used to drive the cover assembly (23) to rotate so as to engage the tube cap (62). A first buffer assembly (3) is provided, one end of which is slidably connected to the support plate (1) in the vertical direction, and the other end of which is connected to the rear end shell (21); the first buffer assembly (3) is used to buffer the rear end shell (21) in the vertical direction. The front end plate (4) is spaced below the rear end component (2). The front end plate (4) has a through hole (41). The tube cap (62) can pass through the through hole (41), and the front end plate (4) can abut against the tube body (61) in the vertical direction. The second buffer assembly (5) has one end slidably connected to the rear shell (21) along the vertical direction, and the other end connected to the front plate (4); the second buffer assembly (5) is used to buffer the front plate (4) along the vertical direction. The cover assembly (23) includes a cover gear (231), a rotating shaft (232), a limiting member (233), a third elastic member (234), and a snap-fit ​​cover (235). The cover gear (231) is connected to the upper end of the rotating shaft (232), and the snap-fit ​​cover (235) is connected to the lower end of the rotating shaft (232). The rotating shaft (232) has a receiving cavity. The third elastic member (234) and the limiting member (235) are connected to the lower end of the rotating shaft (232). 3) All are located within the receiving cavity; the two ends of the third elastic member (234) abut against the inner wall of the receiving cavity and the limiting member (233) respectively, so that the limiting member (233) abuts against the snap-fit ​​cover (235); the snap-fit ​​cover (235) is provided with a snap-fit ​​hole (2351), and the tube cap (62) can pass through the snap-fit ​​hole (2351) to snap between the limiting member (233) and the snap-fit ​​cover (235); The limiting member (233) is provided with a guide protrusion (2331), and the rotating shaft (232) is provided with a guide groove (2321). The guide protrusion (2331) is slidably disposed in the guide groove (2321) along the vertical direction.

2. The opening and closing cover mechanism according to claim 1, characterized in that, The first buffer assembly (3) includes a first guide post (31), a first elastic element (32), and a first connector (33). A first guide hole is provided on the support plate (1) along the vertical direction. The first guide post (31) is slidably disposed in the first guide hole. The first connector (33) is connected to the upper end of the first guide post (31) to abut against the support plate (1), and the lower end of the first guide post (31) is connected to the rear end shell (21). The first elastic element (32) is sleeved on the first guide post (31), and the two ends of the first elastic element (32) abut against the support plate (1) and the rear end shell (21) respectively.

3. The opening and closing cover mechanism according to claim 2, characterized in that, The second buffer assembly (5) includes a second guide post (51), a second elastic element (52), and a second connector (53). A second guide hole is provided on the rear housing (21) along the vertical direction. The second guide post (51) is slidably disposed in the second guide hole. The second connector (53) is connected to the upper end of the second guide post (51) to abut against the rear housing (21), and the lower end of the second guide post (51) is connected to the front end plate (4). The second elastic element (52) is sleeved on the second guide post (51), and the two ends of the second elastic element (52) abut against the rear housing (21) and the front end plate (4) respectively.

4. The opening and closing cover mechanism according to claim 3, characterized in that, The elastic coefficient of the first elastic element (32) is greater than that of the second elastic element (52).

5. The opening and closing cover mechanism according to claim 1, characterized in that, The tube cap (62) is provided with a square limiting plate (621), and the snap-fit ​​hole (2351) is a square limiting hole. The length of the diagonal of the square limiting plate (621) is greater than the length of the side of the square limiting hole.

6. The opening and closing cover mechanism according to claim 1, characterized in that, The rear-end assembly (2) further includes a gear assembly (24), which includes a first gear (241), a second gear (242), and a gear shaft (243). The first gear (241) and the second gear (242) are coaxially mounted on the gear shaft (243) along the vertical direction. The first gear (241) is meshed with the drive end of the drive motor (22), and the second gear (242) is meshed with the cover gear (231).

7. The opening and closing cover mechanism according to claim 6, characterized in that, Multiple card cover assemblies (23) are provided, and multiple card cover assemblies (23) are arranged around the gear assembly (24).

8. The opening and closing cover mechanism according to claim 6 or 7, characterized in that, Multiple gear assemblies (24) are provided, and the multiple gear assemblies (24) are arranged around the drive end of the drive motor (22).

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